Process of treating hides and skins



Patented Mar. 29, 1938 UNITED STATES 2,112,508 PROCESS OF TREATING HIDESAND SKINS Christoph Thomsen,

Alfred Eckelmann, and

Ernst Koch,'Frankfort-on-the-Main, Germany, assignors to I. G.Farbenindustrie Aktiengee sellschaft, Frankfort-on-the-Main, Germany NDrawins. Original 1935, Serial No. 54,944. plication May 19, 1937,Serial No. 143,620.

application December 17, Divided and this air;

Germany December 22, 1934 '4 Claims.

The present invention relates to a process of treating hides and skins.

This application is a division of application Ser. No. 54,944, filedDecember 1'7, 1935, in the name of Christoph Thomsen et al.

We have found that hides and skins are improved by a treatment withbasic compounds containing nitrogen and having a straight or branched,saturated or unsaturated carbon chain of at least 5 carbon atoms, or acycloaliphatic ring containing at least 5 members, in the form of theiraddition salts. The carbon chain may be interrupted by other atoms oratom groups such as, for instance, by O, S, N, C0, CONE, butat least 5carbon atoms must directly be connected with each other. Thesubstitution products and derivatives of these bodies may also be used.

As such compounds there may, for instance,

be named: primary, secondary and tertiary amines, amino-oxides,imidazoles, imidazolines,

pyrimidines; furthermore imido-ethers, imidothioethers and amidines, thelast three obtainable, for instance, according to the copendingapplications Ser. Nos. 751,252 and 751,253, filed November 2,1934, inthe name of Alfred Eckelmann and Ernst. Koch, furthermore substitutedureas, thioureas, guanidines and carbaminic acid esters.

There may be used, for instance, the addition salts of the followingbodies: octylamine, dodecylamine, stearylamine, the technical fattyamines such as, for instance, mixtures of amines prepared from coco-nutoil fatty acid, palm nut oil fatty acid or from technical stearic acid,the

amines made from technical montanic acid or naphthenic acid,abietylamine, para-octylaniline monomethvl-stearylamine, octylglucamine,monooleylhydron-propylene-diamine, stearoyldiethyl ethylenediamine,decylhexahydrophen- 4o ylamine, N-octylaniline,N-stearyl-para-phenylene-diamine, N-dodecylnaphthylamine,dodecylfurfurylamine, dimethyldodecylamine, dodecylmethylglimamine,asymmetric ethyloctylethylenediamine, N-dioctylaniline, dimethyldo- 45decylamine oxide; furthermore N-methylstearbenzimidazole,N-dodecylacetbenzimidazole, N- stearoylhydroxy-ethylacetbenzimidazole,laurimidazoline, N-dodecylpyrimidine, stearimidomethylether,laurimidobutylether, the imidoisobutylether of coconut oil fatty acid,benzimldodecylether, acetimidostearylether, stearimidomethylthioether,stearamidine, the amidine of palm nut oil fatty acid, symmetrical andasymmetrical steardiethylamidine, steardiethylaminoethylamidine,stearethylamidine, monostearylurea, asymmetrical dodecylaminoethylurea,asymmetrical decylmethylolurea, N-stearyl-N'- diethylaminoethylurea,dodecylthiourea, symmetrical dioctylguanidine,diethylaminoethylcarbam'inic acid stearylester, N-dodecylpiperidine,beta-stearylaminopyridine. As salts there may be used, for instance, thechlorides, sulfates, formates or acetates of these bodies.

There may also be used the mixtures of these products with each other orwith other products, for instance: mixtures of stearimidometbyl etherhydrochloride and stearamidine hydrochloride or stearimidazolinehydrochloride, or mixtures of dodecylurea with steardiethylamidinehydrochloride, of stearic acid diethylamide with stearamidinehydrochloride.

Insofar as these bodies are liquid, they may be used without applicationof solvents, otherwise they may suitably be used in the-form of anaqueous solution, or in case they are not sumciently soluble in water inthe form of an emulsion. If necessary, they may be applied inconjunction with organic solvents, oils and the like or with dispersingagents.

The said products are well absorbed by hides and skins. They may beapplied before or during the tanning process. The leathers and furs.which have been prepared from hides and skins either pre-treated withthe said products or in the presence of the said products, have anagreeable soft feel. The tanning process takes place more uniformly andmore rapidly. The products,

furthermore, prevent in many cases deleterious influences on the flber,and, with the aid of these products, there may be obtained leathers ofvery good resistance to tearing. Since many of these products are fastto light, they may be used with orhides thus treatedmayagainveryeasilybesoaked, if necessary, with addition of other soaking mnts.

The following examples serve to illustrate the invention, but they arenot intended to limit it thereto; the parts are by weight:

(1) 100 parts of goat skin are shaken for 20 hours with a solution of 20parts of diethylaminoethylcarbaminic acid stearyl ester hydorchloride in300 parts of water; 9 parts of a formaldehyde solution of 30 per cent.strength are then added and shaking is continued for a further day. Afeebly yellow, somewhat fatty leather of very good resistance to testingis obtained.

I (2) 80 parts of calf-skin are first pre treated with a solution of 8.5parts of steardiethylamidine hydrochloride and 3.5 parts of dodecyi ureain 250 parts of water. Subsequently, 3 parts of acetaldehyde are addedto this liquor and the sun is then after-drummed for a short time. Asoft, feebly yellow leather of very good resistance to tearing isobtained.

We claim: y

l. The process which comprises treating untanned hides and skins withthe salts of basic compounds having the general formula:

Nan,

wherein X stands for ORsNRaR-a, Y stands for O, S,NH,NR4;R,R1,Ra,Ra,R4being members of the group consisting of hydrogen,aliphatic radicals with a straight chain, aliphatic radicals with abranched'chain and radicals having a cycloaliphatic ring, at least oneof the substituent radicalsinsaidbasiccompoundhavingatleast5 caflaonatoms.

2. The process which comprises treating untanned hides and skins withthe salts of carbaminic esters of the general formula: Y v

' NBBi R0 wherein R, R1, R0 stand for members of the group consisting ofhydrogen, aliphatic radicals with a straight chain, aliphatic, radicalswith a branched chain and radicals having a cycloaliphatic ring. atleast one of them having at least carbon atoms.

3. The process which comprises treating untanned hides and skins withdiethyiaminoethyl,--

wherein x stands for ORs, NRaR-a', Y stands for Eli-N81 KOCH.

